DOI: 10.1175/JCLI-D-15-0825.1
Scopus记录号: 2-s2.0-84996772855
论文题名: Local oceanic precursors for the summer monsoon onset over the Bay Of Bengal and the underlying processes
作者: Xing N. ; Li J. ; Jiang X. ; Wang L.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2016
卷: 29, 期: 23 起始页码: 8455
结束页码: 8470
语种: 英语
Scopus关键词: Atmospheric temperature
; Atmospheric thermodynamics
; Surface waters
; Atmosphere-ocean interactions
; Bay of Bengal
; Heat input
; Interannual time scale
; Mixed layer
; Planetary gravity
; Sea surface temperature (SST)
; Summer monsoon
; Oceanography
英文摘要: Local sea surface temperature (SST) plays an important role in the onset of the Bay of Bengal (BoB) summer monsoon (BoBSM). Previous study indicated that the meridionally warmest SST axis (WSSTA) appears in mid-April in the central BoB, which may be a precursor for the BoBSM onset. In this study, it is found that a warm but not the meridionally warmest center, which is defined as the secondary WSSTA (SWSSTA), occurs in early April in the central BoB, leading the BoBSM onset by five pentads. Dates of the SWSSTA occurrence are significantly positively correlated with dates of the WSSTA occurrence in the central BoB and the BoBSM onset on an interannual time scale. The SWSSTA is an earlier precursor for the BoBSM onset. The formation of the oceanic precursor and its impact on the BoBSM onset are as follows. Before the BoBSM onset, resulting from more surface heat input and shallower mixed layer affected by the low-level anticyclone and subtropical high in the central BoB, local SST shows the most rapid increase. Meanwhile, the situation is adverse to the rapid increase of SST in the equatorial BoB. For this reason, the SWSSTA occurs, and the WSSTA subsequently appears in the central BoB. The WSSTA in turn enhances local convection, eliminates the low-level anticyclone, and moves the subtropical high outward away from the BoB by inducing atmospheric instability, thus developing a heating center. Convectional heating further strengthens southwesterlies in the BoB by exciting mixed planetary-gravity waves, resulting in the BoBSM onset. © 2016 American Meteorological Society. 资助项目: NSFC, National Natural Science Foundation of China
; NSFC, National Natural Science Foundation of China
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50088
Appears in Collections: 气候变化事实与影响
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作者单位: College of Global Change and Earth System Science, Beijing Normal University, Beijing, China; Meteorological Observatory, Joint Center for Global Change Studies, Beijing, China; Joint Center for Global Change Studies, Beijing, China; Institute of Plateau Meteorology, China Meteorological Administration, Chengdu, Sichuan, China
Recommended Citation:
Xing N.,Li J.,Jiang X.,et al. Local oceanic precursors for the summer monsoon onset over the Bay Of Bengal and the underlying processes[J]. Journal of Climate,2016-01-01,29(23)